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GB/T 25825-2010Rolls for hot strip mills and plate mills (English PDF)

热轧钢板带轧辊

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

Level / Type

National · Recommended

Issue date

December 23, 2010

Implementation date

September 1, 2011

Scope

GB/T 25825-2010 is the English-translated version of 热轧钢板带轧辊.

China's national standard for the rolls used in hot strip and plate mills. It specifies the classification, the technical requirements, the test methods, the inspection rules and the marking, packaging, transport and storage of hot rolling rolls.

A mill roll is a consumable that costs as much as a machine tool.

It is a large forged or cast cylinder that must be hard enough at the surface to resist wear and the abrasion of scale, tough enough in the body not to break, and stable enough to keep its profile while a strip at eleven hundred degrees passes under it under a load of thousands of tonnes - and it is cooled by water sprayed onto a surface that is repeatedly heated by the stock, so it lives in continuous thermal cycling.

Its failure modes are what the standard is written against: surface spalling, where fatigue below the contact surface detaches a piece of the barrel; firecracking, the network of thermal fatigue cracks that develops on the surface and eventually prints onto the strip; and outright breakage, which in a mill running at speed destroys the stand.

The classification is by position, because the duty differs completely along the mill.

Roughing rolls take heavy reductions on thick hot stock and are chosen for toughness and hot strength; finishing work rolls run at speed against thin strip and are chosen for wear resistance and surface quality, which is why high-chromium and high-speed steel work rolls displaced the older grades; and back-up rolls carry the separating force without touching the stock and are chosen for bulk fatigue strength.

So the standard specifies the materials and manufacture for each, the hardness and its uniformity along the barrel, the microstructure, the non-destructive examination and the dimensional requirements. Issued on 23 December 2010 and in force since 1 September 2011.

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Document preview — GB/T 25825-2010

National Standard of the People's Republic of China

ICS: 77.180
Classification: H 94

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

1 Scope
2 Normative References
3 Technical Requirements
4 Test Methods
5 Inspection Rules
6 Packing, Labeling and Quality Certificate

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. Appendix A of this standard is a normative appendix. The standard proposed by China Iron and Steel Association. This standard by the National Steel Standardization Technical Committee (SAC/TC183) centralized. This standard was drafted. a total of Jiangsu Chang Roll Co., Ltd., China Steel Research Institute Group Limited. The main drafters of this standard. Shao Shun Cai, oath Yu Da, Zhou Jun, Shaosu Yun, Palace open orders, Zhou Qin Zhong, Zhang Wenjun, Li Wu. Hot-rolled steel strip roll

6 Packing, Labeling and Quality Certificate

Appendix A (Normative) Ultrasonic Testing Method for Rolls for Hot Strip Mill and Plate Mill

Referred in GB/T 25825-2010:

GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products * GB/T 223.3-1998 *

GB/T 223.5-2008 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method *

GB/T 223.11-2008 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method *

GB/T 223.13-2000 Methods for chemical analysis of iron, steel and alloy－The ammonium ferrous sulfate titration method for the determination of vanadium content *

GB/T 223.18-1994 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content * GB/T 223.19-1989 *

GB/T 223.20-1994 Methods for chemical analysis of iron steel and alloy.The Potentiometric titration method for the determination of cobalt content *

GB/T 223.21-1994 Methods for chemical analysis of iron steel and alloy.The 5-CL-PADAB spectrophotometric method for the determination of cobalt content *

GB/T 223.22-1994 Methods for chemical analysis of iron ,steel and alloy.The nitroso-R-salt spectrophotometric method for the determination of cobalt content *

GB/T 223.23-2008 Iron, Steel and Alloy-Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method *

GB/T 223.25-1994 Methods for chemical analysis of iron, steel and alloy.The dimethylglyoxime gravimetric method for the determination of nickel content *

GB/T 223.26-2008 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method * GB/T 223.28-1989 * GB/T 223.38- *

GB/T 223.40-2007 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method *

GB/T 223.43-2008 Iron steel and alloy - Determination of tungsten content - Gravimetryc method and spectrophotometric method * GB/T 223.46- *

GB/T 223.59-2008 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method *

GB/T 223.60-1997 Methods for chemical analysis of iron,steel and alloy The perchloric acid dehydration gravimetric method for the determination of silicon content * OB/T 223.62- * OB/T 223.63- * CB/T 223.64- *

GB/T 223.65-2012 Steel, iron and alloy - Determination of cobalt content - Flame atomic absorption spectrometric method * GB/T 223.66-1989 *

6 Packing, Labeling and Quality Certificate

70.0 Implemented on

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Detail of GB/T 25825-2010 Standard No.

Rolls for hot strip mill and plate mill Chinese Name 热轧钢板带轧辊

Chinese Classification H94

Professional Classification GB ICS Classification Issued by AQSIQ;SAC Issued on 2010-12-23 Implemented on 2011-9-1 Status valid Superseded by Superseded on Abolished on Superseding Language English File Format PDF Word Count 5000 words

Translation Price(USD)

70.0 Keywords

GB/T 25825-2010, GB 25825-2010, GBT 25825-2010, GB/T25825-2010, GB/T 25825, GB/T25825, GB25825-2010, GB 25825, GB25825, GBT25825-2010, GBT 25825, GBT25825

Introduction of GB/T 25825-2010

本标准规定了热轧钢板带轧辊的技术要求, 试验方法, 检验规则, 标识, 包装, 质量证明书和超声波检测方法.

本标准适用于公称宽度为1200mm 及以上的热轧钢板和钢带轧机用工作辊, 支承辊及立辊.

This standard specifies technical requirements, test methods, inspection rules, labelling, packing, quality certificate and ultrasonic testing method all regarding rolls for hot strip mill and plate mill.

This standard is applicable to working roll, supporting roll and vertical roll for hot strip mill and plate mill, of which the nominal width is not less than 1200mm.

Contents of GB/T 25825-2010 Foreword I

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4829 · ISO 4937 · ISO 10700.1994

Similar standards

GB/T 1503-2008|GB/T 25744-2010|GB/T 11345-2013|GB/T 230.1-2018|GB/T 13298-2015|GB/T 2523-2022

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